JPH09233768A - Cooling device for stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device with good workability. SOLUTION: This cooling device consists of a cylindrical frame 3, a stator iron core 21 fixed onto the inner surface of the frame 3, a plurality of slots 23 for storing a coil 22 fitted onto the stator iron core 21, cooling pipes provided at the opening parts 25 of respective slots 23, and an inlet and a outlet for refrigerant fixed onto the frame 3. A cooling pipe 4 fitted onto the outer diameter of the stator iron core 21 is formed so as to spirally-reach continuously a cooling pipe storage groove 24 formed in the axial direction and the opening 25 of the slot 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core and coil cooling device.

[0002]

2. Description of the Related Art As a conventional technique, a cylindrical frame,
A stator core fixed to the inner surface of the frame, and a plurality of slots for accommodating the coils provided in the stator core,
The cooling pipe provided at the opening of the slot communicates with one end of the cooling pipe, the inlet fixed to the frame communicates with the other end of the cooling pipe, and the discharge fixed to the frame. There is a cooling device for a stator having an outlet (for example, Japanese Utility Model Laid-Open No. 3-77260).

[0003]

However, in the prior art, since the coil is housed in the slot, both ends of the cooling pipe provided in the slot opening are welded so as to communicate with the ring-shaped pipe. This was a difficult task because it was necessary to work while preventing the dielectric breakdown of the stator winding due to welding. Therefore, an object of the present invention is to provide a cooling device for a stator, which has good workability.

[0004]

In order to solve the above problems, a tubular frame, a stator core fixed to the inner surface of the frame, and a plurality of slots for accommodating coils provided in the stator core are provided. In a cooling device for a stator provided with a cooling pipe provided in each slot opening and a refrigerant inlet / outlet fixed to the frame, an axial direction provided on an outer periphery of the stator core Cooling tube storage groove,
The cooling pipe accommodating groove and the opening of the slot are continuously provided in a spiral shape.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A tubular frame, a stator core fixed to the inner surface of the frame, a plurality of slots for accommodating coils provided in the stator core, and openings provided in the respective slots. In a cooling device for a stator having a cooling pipe and an inlet and a discharge port fixed to the frame, an axial cooling pipe housing groove for housing the cooling pipe is provided on an outer periphery of the stator core, Flexible cooling tube
One or several continuous cooling pipes are provided, and the cooling pipes are arranged so as to continuously extend spirally between the opening portion of the slot and the cooling pipe housing groove. When the coolant is supplied to the cooling pipe, the iron loss and the copper loss generated in the stator absorb the heat not only on the outer peripheral surface of the stator but also on the inner peripheral surface and the coil end portion. The temperature of the inner peripheral surface of the stator can be lowered. Further, the heat of the rotor core can be efficiently removed via the air gap.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view, and FIG. 2 is a virtual side sectional view showing a state in which a coil end is removed. Reference numeral 1 denotes a rotor in which a rotor core 12 is fixed to a rotary shaft 11. Reference numeral 2 denotes a stator fixed to the inside of the frame 3 and having coils 22 wound in a plurality of slots 23 provided in the stator core 21. The rotor 1 is arranged on the inner peripheral side of the stator 2 via an air gap. Both ends of the coil 22 in the axial direction are coil ends protruding to both sides of the stator core 21. Reference numeral 4 denotes one or several continuous cooling tubes having flexibility, and has a thickness that does not project outside the slot opening 25. The cooling pipe 4 is embedded in the slot opening 25 on the inner peripheral surface of the stator iron core 21, and is embedded in the axially extending cooling pipe housing groove 24 provided on the outer periphery of the iron core 21 on the outer peripheral surface. . The material of the cooling pipe 4 is preferably copper, which has good thermal conductivity, but is not limited to this. After the coil 22 is housed in the slot 23, the slot opening 25 and the cooling pipe housing groove 24 are continuously spirally formed so as to surround the inner peripheral side of the coil 22 and the coil end.
Is wrapped around, and makes one round in the circumferential direction. After the cooling pipe 4 is housed in the slot 23 and the cooling pipe housing groove 24, it is molded with resin without any gap. Both ends of the cooling pipe 4 are drawn out to the outside through extraction holes 31 provided in the frame 3, and a coupling 41 for connecting with a conduit (not shown) for supplying a refrigerant is attached to the tip thereof. There is.

[0007]

As described above, according to the present invention,
Since a continuous cooling pipe is wound around the stator, it is easy to manufacture, and not only through the stator, but also through the air gap,
Since the rotor can be cooled sufficiently, various troubles caused by thermal deformation can be avoided.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a virtual side sectional view showing a state in which a coil end of the embodiment of the present invention is removed.

[Explanation of symbols]

 1 Rotor 11 Rotating Shaft 12 Rotor Iron Core 2 Stator 21 Stator Iron Core 22 Coil 23 Slot 24 Cooling Pipe Storage Groove 25 Slot Opening 3 Frame 31 Extraction Hole 4 Cooling Pipe 41 Coupling

Claims (1)

[Claims] 1. A tubular frame, a stator core fixed to an inner surface of the frame, a plurality of slots for accommodating coils provided in the stator core, and slots provided in openings of the respective slots. A cooling device for a stator comprising a cooling pipe and a coolant inlet and outlet fixed to the frame, wherein an axial cooling pipe storage groove is provided on an outer periphery of the stator core, and the cooling pipe storage groove. A cooling device for a stator, comprising: a cooling pipe that continuously extends in a spiral shape between the slot and the opening of the slot.